patch 8.2.4026: ml_get error with specific win_execute() command

Problem:    ml_get error with specific win_execute() command. (Sean Dewar)
Solution:   Check cursor and Visual area are OK.

src/evalwindow.c

@@ -743,6 +743,12 @@ f_win_execute(typval_T *argvars, typval_T *rettv)
 	// Update the status line if the cursor moved.
 	if (win_valid(wp) && !EQUAL_POS(curpos, wp->w_cursor))
 	    wp->w_redr_status = TRUE;
+
+	// In case the command moved the cursor or changed the Visual area,
+	// check it is valid.
+	check_cursor();
+	if (VIsual_active)
+	    check_pos(curbuf, &VIsual);
     }
 }
 

src/testdir/test_execute_func.vim

@@ -153,8 +153,23 @@ func Test_win_execute_visual_redraw()
   call setline(1, ['a', 'b', 'c'])
   new
   wincmd p
+  " start Visual in current window, redraw in other window with fewer lines
   call feedkeys("G\<C-V>", 'txn')
   call win_execute(winnr('#')->win_getid(), 'redraw')
+  call feedkeys("\<Esc>", 'txn')
+  bwipe!
+  bwipe!
+
+  enew
+  new
+  call setline(1, ['a', 'b', 'c'])
+  let winid = win_getid()
+  wincmd p
+  " start Visual in current window, extend it in other window with more lines
+  call feedkeys("\<C-V>", 'txn')
+  call win_execute(winid, 'call feedkeys("G\<C-V>", ''txn'')')
+  redraw
+
   bwipe!
   bwipe!
 endfunc

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4026,
 /**/
     4025,
 /**/